Hugo klein and fato xuhn



A .28,19% 1,6 1 ug 1am-.Em 1:1' AL. szf'lf @1319x0125 on .un Hmyrnns Filed June v, 1926A klm L] LIM .lullinl luunl Patented Aug. 2s, 192s- UNITED 'STA-TES KLEIN AND PAUL KUHN F NIEDEBSCHELDEN-SIEG, I

omwonx ron. am mamans.

application mea :une 7, laas, semina.

This invention relates improvementslin air heaters, especially used 1n connection wlth the blast furnaces, and has partlcular reference to the gridwork construction for such` 5 heaters.

Hitherto the gridwork of an air for blast furnaces was constructed of rectangular, hexagonal and substantially round shafts In order to obtain large surfaces square and rectangular shafts have been constructed with undulating surfaces. ,y

By means of the experiments carried VAout at the Charlottenhiitte (Charlotten mine) published under No. 82 of the Wrmestelle (Heat Department) Dsseldorf- 1t has been proven, on the basis of technical mvestlgations, that the grid construction ofthe grldwork with square, Arectangular and.l other shafts of the same cross section is erroneous from the standpoint 'of the heat absorblng qualities thereo In recent times so-called roll or spiral stones of various sizes have been used inplace of the above mentioned shafts for obtaining a'larger heat absorbing surface. In the past,

' air heaters were operated with un urified or,

at best, with preliminarily purifie blast furv nace gas. With unpuried gas a cleaning l Thishas been effected b illuminating the separate shafts of the gri work and cleamng of the shaft was uently necessa but` even when using pre arlly pu ed or purified gas an inspection and cleamng of the gridwork was necessary from time to tlme.

the same with brushes. 5

The use of roll and spiral stones prevents such cleaning. If after a long period of tlme 4o a stoppage or clogging with dust or a deformation takes place at one point of the roll or spiral stonesthe feiciency of the heater 1s.Vv decreased without itbeing possible by-examinaton of the interior to ascertain the necessary to remove the gridwork 'In orderI to eliminate all the disadvantages of the griglwork constructions hitherto known, the present Vinvention has for its obcause of the Alow ecency. `It is therefore ject to provide a gridwork wherein, at the points of higher temperature, thereare provided large cross sections with small surfaces and 'thick walls, and at the points of lower tem rature there are provided smaller cross -55 sectlons with .larger'surfaces Vand thinner 14) is divided into zones A, B, fC. T

bned area of four openings of the 114,284,v and in Germany April 3, 1926.

walls. This construction produces a thor- I hitherto employed. of the same cross section throughout the 10 whole height of the heater. 1

- surfaces by meanslof which considera economy is e'ectedfdue to the" fact that the heaters canbe built considerably lower in height:

In accordance with the above objects, stones of the simplest construction are used whlch can be cheaply produced and therefore new'air heatersmay bev constructed at about 50% reduction in cost belowthat of heaters heretofore used. The economies reslde 1 n the lower height ofthe construction and, 1n addition, the efficiency of these new a1r heatersnis considerably-higher.

The same economies are effected in the reconstruction of old air heaters, as by the reconstruction the existingair heaters can be made lower. In spite of this it is possible to increase the stone surface considerably and to lmprove theeiciency by smaller losses 1n exhaust gases and reduction in radiation losses.

In the drawin there-is shown by way o f example the gri work of an air heater constructed in accordance with the invention. It will be understood that the gridwork for -regenerators andthe like can be; carried out in a similar manner. Figures 1, 2 and|-3 are fragmentary-plan views of the idwork employed in diferent zones of the ater.

Figure 4 is 'a of the heater. v In the form of construction shown, the interior f the body of the air heater (Figure partial view of the interior gridwork a (Figure 1) fills the u'pperzone A. Under the gridwork u, in the zone B, there is thendisposed the gridwork b (Figure 2) and underneath this the gridwork c (Figure 3) in the zone C.

The gridwork is so lassembled that the comc is always equal to two correspondlng openhe wide idwork ings of the' gridwork b and one opening of i the gridwork a.

, In this manner the' cleaning with brushes Having ynow particularly described and ascertained the nature of our said invention and in What manner the same is to be performed, We declare that what We claim is:

1. In an air heater for blast furnaces, a body divided into zones all of which are 1n superposed relation, and a grdwork in each zone and including heat absorbing plates, the plates of the gridwork in the zone of the highest temperature having large cross sections and small surfaces, and those in zones of lower temperatures having smaller cross sections and larger surfaces.

2. In an air heater for blast furnaces, a

body divided only horizontally into different temperature zones, anda gridwork in each zone including heat .absorbing plates the cross sectional areas of which vary in the different zones directly with the temperatures therein, While the surface areas of which in the diderent zones vary indirectly as the temperatures.

3. In an air heater for blast urnaces, a

body divided into different temperature `including plates forming openings therebetween, the area of an opening in the gridwork .in the z'one of highest temperature being equal to the combined areas of tWo openings in the gridwork in the zone of next lower temperature, and also equal to the combined areas of four openings in the gridwork in the zone of the next lower temperature.

In testimony whereof we have signed our i names to this specification. Y

HUGO KLEIN. PAUL KUHN. 

